Sun Pumps MTR BLM-SB-073S-60 - Manual (Page 6)

3.2 System Design Basics (Read carefully before installation)
1. For optimum pump performance make sure that the wire is sized properly for
the length of run between the pump and the solar modules. Wire sized too small
will cause a decreased output from the pump. Keep the distance from the solar
modules to the pump as short as possible. Refer to a DC wire loss chart for
proper sizing. It is recommended to keep the voltage drop under 3%.
2. Due to the aggressive action of DC power, it is essential that any under-water
splice be made correctly. This splice must be watertight. Improper sealing of
the splice will cause poor pump performance and may cause damage to the
system.
A SunPumps splice kit S-703 is recommended for this watertight
connection.
3. Never install a pump in a well that has had an oil-lubricated line shaft turbine in
it without cleaning it first. Any drip oil remaining in the water may damage the
pump shaft bearing sleeves.
4. Never install the controller in direct sunlight. Direct sunlight on the controller
may cause over-heating of the controller.
5. Never lay the controller on the ground or mount the controller in a horizontal
position. The controller should be mounted in a vertical position only. A
convenient place to mount the controller is on the north side (shaded side) of the
solar module array.
6. The controller should be grounded to the pump motor housing, the frame of the
solar modules and to an 8-foot ground rod. If the well casing is steel it may be
used as the ground rod. Drill and tap a hole in the casing or weld a bolt to the
casing for the ground lug. Use only a copper lug to attach the ground wire. The
cemented support structure pole will not provide an adequate ground. Do not
ground the positive or negative electrical wires.
7. Do not ground the positive or negative electrical wires.
3.3 Well Measurements
Before installing the pump measure the depth of the well (bore hole) and static water
level. The static water level is the distance from the top of the well casing to the water
level in the well (bore hole). This information is necessary in determining the pump
setting (See Figure 1).